Add reviewer/labels to dependabot PRs (#17743)

.github/dependabot.yml

@@ -2,5 +2,8 @@ version: 2
 updates:
   - package-ecosystem: "github-actions"
     directory: "/"
+    labels: CI
+    reviewers:
+      - "qmk/collaborators"
     schedule:
       interval: "daily"